Deformed reinforcing-bar for concrete.



W. A. COLLINS. DBFORMED REINFORGING BAR FOR CONCRETE.

APPLICATION FILED SEPT. 7, 1909.

l,016,98%; Q Patented Feb. 13,1912.

PATENT @FFICE.

ED" STATES DEFORIVIED REINFORCING-IBAR FOR CONCRETE.

Specification of Letters Patent.

Patented Feb..13, 1912.

Application filed September- 7, 1909. Serial No. 516,580.

To all whbmz't may concern:

Be it known that I,WILL1AM' A. COLLINS, a citizen of the United States,and a resident of the city of Chicago, in the county 5 of Cook and Stateof Illinois, have invented certain new and useful Improvements inDeformed Reinforcing-Bars for Concrete; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to 'the accompanying drawings, and to the letters of referencemarked thereon, which form a part of this specification.

My invention relates to certain improvements in deformed reinforcingbars for concrete, as will be hereinafter more definitely pointed outand claimed, reference being had to the accompanying drawing, in whichFigure 1 illustrates a round bar embodying my invention. Fig. 2 is asimilar view at right angles with Fig." 1. Fig. '3 is a section taken online 44 of Fig. 2.

As shown in the drawings: the figures illustrate a round bar embodyingmy invention. Said bar 1, is provided with bond- 'ng projectionsor lugs2,.arranged in pairs staggered for the lengthfof the bar, each of saidpairs being equal in length to the semi-circumference of the bar. Eachpair of projections or lugs 2 is spaced apart to provide a centralbonding key or space 3, provided with abrupt shoulders t-5, and one ormore bonding spaces 6, of less depth than the key 3,-may be provided, ifdesired. In the construction shown, the concrete firmly bonds in the key8, and, owing to the abrupt shoulders 4 or 5, the concrete preventsslippage and affords a very rigid construction. If desired the lugs orprojections 2 may be divided into more than two sections, and in anyevent the bar is not weakened as the keys are provided in the lugs only.The diagonally or dia. metrically opposite abrupt shoulders 14 or 15,afl'ord excellent bonding faces and serve to rigidly anchor the bars inthe concrete.

Of course, any shape or size bar may be employed and various details ofconstruction may be varied withoutdeparting from the principles of thisinvention, and I therefore do not desire to limit myself otherwise thannecessitated by the prior art.

/ I claim as my invention? A reinforcing bar or rod having a series oftransverse projections or lugs arranged in groups that are oppositelydisposed on said bar, the members of said groups being extended eachhalf-way around said bar or rod and being of even height throughout, andin staggered relation transversely with respect to each other andalternately disposed, the members of each of said groups being inalinement longitudinally of said bar or rod and being provided withbonding spaces.

In testimony whereof I have hereunto subscribed my name in the presenceof two subscribing witnesses.

WILLIAM ARTHUR COLLINS. Witnesses:

K. E. HANNAH,

LAWRENCE REILESTEIN.

